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London Geodiversity Partnership @londongeodiversity.bsky.social · 06/10/2026

On #internationalgeodiversityday discover London’s surprising geodiversity via our website! londongeopartnership.org.uk

Text reads: 6th October 2026
LONDON GEODIVERSITY PARTNERSHIP
If you live in London, then today is the day to find out more about the geology of London!
INTERNATIONAL GEODIVERSITY DAY 2026
GEODIVERSITY ON OUR DOORSTEP

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Ruth Siddall @pavementgeology.bsky.social · 06/10/2026

Today is #InternationalGeodiversityDay and the theme this year is Geology on Your Doorstep. Just the opportunity to submit a a building stone location to London Pavement Geology! It’s not just London, you can submit a geosites anywhere in the UK www.londonpavementgeology.co.uk/submit-a-loc...

Text reads: INTERNATIONAL GEODIVERSITY DAY 2026: GEODIVERSITY ON OUR DOORSTEP + LONDON PAVEMENT GEOLOGY CHALLENGE!

Text reads: INTERNATIONAL GEODIVERSITY DAY 2026 - GEODIVERSITY ON OUR DOORSTEP
Submit a local stone building to our website
1. Take photos of the building and a close up of the stone (~30 × 30 cm field of view)
2. Fill in the form on our website at 'Submit a Location' (www.londonpavementgeology.co.uk/submit-a-location/) and upload your photos. Include the location and postcode but you can leave other fields blank.
3. Click submit and we'll let you know when your location is live!
LONDON PAVEMENT GEOLOGY

A photomontage showing different types of buildings and different types of stones used in uk buildings. They are a stately home, a marble tombstone, a Hindu temple, a London pub, a granite paving stone, a war memorial, a shop front, a church and a cafe.

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Ruth Siddall @pavementgeology.bsky.social · 06/10/2026

#urbangeology of the century on the Finchley Road, north London 🧵

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SempaiScuba @sempaiscuba.bsky.social · 06/09/2026

6 September 1962: Peter Marsden discovered the first of the Roman "Blackfriars Ships" on the banks of the River #Thames in #London. #History #Archaeology

View of the Blackfriars Ship 1 during excavation.

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Oscar Lozada @oz-of-the-ancients.bsky.social · 28/09/2026

Love this dramatic shot, this mosaic must have stunned London when it was found in 1869! #MosaicMonday This is the 'Bucklersbury Pavement' from the early 200s CE, probably part of a wealthy villa or baths in the centre of old Londinium 📸 The London Museum 🏺 #archaeology #ancientbluesky

A black and white illustration of Victorians on a walkway crowding around a roman mosaic open on the floor, with large buildings rising in the background

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Alison Fisk @alisonfisk.bsky.social · 02/10/2026

Ornate Saxon copper disc brooch decorated with gold and garnets, AD 650-670. It must have been a treasured possession! From Floral Street, Covent Garden, once the heart of ‘Lundenwic’, the early Saxon town of London. Museum of London 📷 by me #FindsFriday #Archaeology

My photo shows a circular Saxon brooch made of copper, the front of which is ornately embellished with gold and garnets. There are five raised, circular, gold bosses which are outlined with inlaid garnet slabs, and each set with a central, round garnet. Four of the gold bosses are arranged around a fifth, larger, gold boss in the centre of the brooch. The central boss sits within a star-like, four-pointed geometric shape composed of a mosaic of inlaid garnet slabs. The outer edge of the brooch is decorated with two rows of tiny inlaid polished garnets. The eight gold sections at either side of the four smaller bosses are decorated with raised gold filigree which looks like looped, braided cord. Parts of the brooch are worn, with some chipped edges, and missing garnet stones. The brooch measures approximately 7 cm in diameter. It is displayed on a clear glass surface. It was excavated from a woman's grave by AOC Archaeology in 2000 ahead of development construction works. This type of brooch was a fashionable status piece amongst wealthy aristocratic Anglo-Saxon women in the AD 600s. The woman's grave also contained glass beads and silver rings.

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Prof Frank McDonough @fxmc1957.bsky.social · 04/10/2026

4 October 1936. Battle of Cable Street took place in Cable Street, Whitechapel, London. It was a clash between the Metropolitan Police, protecting a march by the British Union of Fascists (BUF) led by Sir Oswald Mosley and various anti-fascist and Jewish demonstrators.

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London Geodiversity Partnership @londongeodiversity.bsky.social · 04/10/2026

A few more pictures from yesterday’s geoconservation day at Riddlesdown Quarry. Along with conservation we also provided info on the geology of the Chalk. Our regular volunteer Oneke brought along some fossil sea urchins that she had found the previous year #londongeology #fossils

A close up of the two fossil sea urchins in their display cases

A close up of the two fossils lying on the grass with a ruler next to them, showing that they are each 3-4 cm diameter.

Volunteers putting cleared shrubs onto the bonfire. A white chalk cliff is behind them.

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London Geodiversity Partnership @londongeodiversity.bsky.social · 03/10/2026

Our annual geoconservation day at Riddlesdown Chalk Quarry is well underway! Conserving geological sites by cutting back plant growth is essential for preserving outcrops. Geology does not necessarily look after itself! #londongeology

Liam Gallagher is in charge of the bonfire for burning the the cleared plant debris. Behind him is a grove of birch trees and behind them is the white chalk cliff face.

Volunteers with wheelbarrows cutting back new growth in the quarry.

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Ruth Siddall @pavementgeology.bsky.social · 02/10/2026

BIG NEWS! Check out our brand new website and logo, designed by Livetech and now live at www.londonpavementgeology.co.uk

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Ruth Siddall @pavementgeology.bsky.social · 19/09/2026

Do drop in to @geolsoc.bsky.social for today’s open house! See the Mary Anning portrait, the William Smith map and I’ve put together a tour of the stones used in the interior. The Geol Soc gents toilets are pretty special in the world of #urbangeology! 😉 programme.openhouse.org.uk/listings/4938

A chimney piece made of a red and yellow mottled marble in the library

The portrait of Mary Anning hung on a wall over a fossil ichthyosaur jaw in a glass case standing on a limestone plinth

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London Geodiversity Partnership @londongeodiversity.bsky.social · 13/09/2026

A last-minute visit to @gaildickerson.bsky.social’s installation and residency at Beaconsfield Gallery in Vauxhall. Art inspired by the geology on London #londongeology

Gail Dickerson at Beaconsfield amongst the paintings she has made - these are laid out on the sloping floor of the gallery.

A section showing the geology of London in the Vauxhall area with the different strata depicted using paints made from them.

Gail standing behind a huge painting, several metres in length, made with London Clay and allowing water to flow across it.

Rock samples: London Clay and Lambeth Group mottled clay.

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Colne Valley Regional Park @colnevalley.bsky.social · 13/09/2026

As we learnt at the #Harmondsworth Barn 600th Anniversary Conference from Ruth Siddall @pavementgeology.bsky.social @londongeodiversity.bsky.social

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London Geodiversity Partnership @londongeodiversity.bsky.social · 07/09/2026

A new, three-part Geotrail which traces the route of the River Westbourne from Hampstead Heath to the Thames, is now available to download from our website londongeopartnership.org.uk/geotrails/#W... #londongeology #londonsrivers #walklonson

The cover of the guide titled Walking the Westbourne: a geological trail along the River Westbourne from Branch Hill Pond to the Thames. The cover includes the London Geodiversity Partnership and Redington Frognal Association logos and a photomontage showing street signs, views and other features along the trail.

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Sherlock Holmes @bakerstreetholmes.bsky.social · 30/08/2026

Opened in 1843, the Thames Tunnel was the first tunnel ever dug beneath a navigable river. Marc Brunel's iron shield did the digging; his son Isambard nearly drowned in the 1828 flood. A million visitors walked through in the first fifteen weeks. Would you have queued?

An 1843 printed advertisement announcing the Thames Tunnel's opening to the public, showing three views: Brunel's great iron shield at work underground, a long section of the tunnel beneath the river, and visitors descending the staircase at the shaft.

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Tim Holt-Wilson @timholtwilson.bsky.social · 25/08/2026

Selenite - 'Moon Mineral' crystals are found in Suffolk in the London Clay. They are formed from the interaction of calcite and sulphuric acid derived from the weathering of pyrite (iron sulphide) in the clay. I marvel at their translucent, icy beauty. #geology #Suffolk @geolsocnorfolk.bsky.social

Selenite crystals seen through the eye of a microscope looking like an icy moonscape.

A clump of selenite (gypsum) crystals exhibiting characteristic, contact twinning in an 'arrowhead' or 'swallow-tail' configuration. A blue biro pen gives a sense of scale.

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London Geodiversity Partnership @londongeodiversity.bsky.social · 27/07/2026

We had a very enjoyable trip to Crystal Palace Park today to visit the newly restored prehistoric creatures and geological illustrations. We were unanimously impressed! It’s great to be able to see everything so clearly #urbangeology #crystalpalacedinosaurs @cpdinosaurs.bsky.social

The sculptures of Megaloceras (Giant Irish Elk)

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Prof Chris Jackson @seismatters.bsky.social · 27/07/2026

Someone recently made a quip that, “if you’ve seen one rock, you’ve seen them all”. It was a joke, I guess, aimed in my direction and geologists more generally. Although I think the rock-centric way geology sometimes sells itself is foolish…this person couldn’t be more wrong…[1/2]

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Ruth Siddall @pavementgeology.bsky.social · 23/07/2026

My last #urbangeology walk before the summer break is this Saturday at 2.30 pm. This is one of my most popular walks taking in some great sites and fantastic rocks, minerals and fossils! Register at www.walks.com/our-walks/th...

A photograph of the Siege of Malta Memorial which we will visit on the walk. Text reads ‘discover fossils, stone and astronomy in the city of London! The Monument, The Moon and Malta: urban geology on Eastcheap. Meet at 14.30, Monument Station, Fish Street Hill Exit.

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London Geodiversity Partnership @londongeodiversity.bsky.social · 22/07/2026

We love this mammoth mosaic so much that we’ve decided to add it to our SGI citation. The updated link is below londongeopartnership.org.uk/wp/wp-conten... #londongeology @redbridgemuseum.bsky.social

londongeopartnership.org.uk

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Ruth Siddall @pavementgeology.bsky.social · 22/07/2026

A big thanks to Duncan Grieg and @ucllifesciences.bsky.social for inviting to talk yesterday on what we can learn from #urbanpalaeontology and #urbangeology

The title slide from my talk. The background is a Spanish limestone, crowded with the fossil gastropod Nerineia. The text reads ‘What building stones can tell us about palaeoecolology, Ruth Siddall’.

A photo of Portland stone patch reef showing oysters and the alga Solenopora in growth position

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Paul D. Taylor @nhmbryozoa.bsky.social · 20/07/2026

#MolluscMonday Small (<2 cm) glycymerid bivalve shell with characteristic taxodont dentition. Photographed on a building stone (almost certainly Oligocene Calcaire à astéries) in St Émilion, the famous centre for Bordeaux wine.

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London Geodiversity Partnership @londongeodiversity.bsky.social · 20/07/2026

One of the things I’m often asked when identifying rocks & minerals is ‘is this a meteorite?’ The answer is always no; what they have found is industrial slag. These are slags from the Thames near Rainham where Murex Ltd metal works were located #londongeology #metalslags #mineralindustry

A photo of two chunks of glassy, blue and greenish grey iron slag.

A piece of crystalline slag with variolitic sheaves of white and green minerals.

A photo of concrete with chunks of black and blue-green glassy slags used as aggregate.

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Ruth Siddall @pavementgeology.bsky.social · 19/07/2026

The Ilford Mammoth skull is in @nhm-london.bsky.social and there is a cast in Redbridge Museum, Ilford.

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Ruth Siddall @pavementgeology.bsky.social · 19/07/2026

A mosaic of ‘Marley the Ilford Mammoth’ made from plastic bottle tops by artist Caitlin Atherton commemorates a mammoth skull excavated in 1863 from Uphall brick pits, Ilford. It’s a steppe mammoth, which lived c 200,000 ka 🦣 londongeopartnership.org.uk/wp/wp-conten... #londongeology

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The Geologists' Association @geolassoc.bsky.social · 17/07/2026

Save the date! Join us and our colleagues from @rockwatch.bsky.social on Saturday 7th November 2026 from 10.30am - 4.30pm at Burlington House in London for our FREE Festival of Geology. Full details coming soon via our website: geologistsassociation.org.uk/festival/

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Patricia Stoughton @patriciastoughton.bsky.social · 17/07/2026

Low tide at Lambeth...

Seen from Victoria Tower Gardens, a man with his son walking to the end of an old pier, only revealed at low tide. Beyond, you can see the arches of Lambeth Bridge.

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Ruth Siddall @pavementgeology.bsky.social · 13/07/2026

I finally had the opportunity to visit the @urbanlearners.bsky.social’s ‘If stones could speak’ pavilion in St Paul’s churchyard. Gabions display architectural and archaeological material from London including details in Portland and Reigate stone and a lovely Mayen basalt quernstone #urbangeology

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Ruth Siddall @pavementgeology.bsky.social · 14/07/2026

A splendid piece of #urbangeology in Principal Place, London EC2A. Colour Field by artist collaboration Objects of Common Interest reuses stone - mainly Iranian travertines & Italian marble - salvaged from demolition projects. It’s there until September and part of London Festival of Architecture

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Waltham Forest Echo @walthamforestecho.bsky.social · 14/07/2026

Greggs' pays tribute to Harry Kane by renaming Blackhorse Road store Greggs' Blackhorse Road store has been renamed KANES walthamforestecho.co.uk/2026/07/14/…

walthamforestecho.co.uk

Greggs' pays tribute to Harry Kane by renaming Blackhorse Road store

Greggs' Blackhorse Road store has been renamed KANES

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London Geodiversity Partnership @londongeodiversity.bsky.social · 13/07/2026

This is an interesting and well-informed article in the CIBSE Journal on the problems of both heating and cooling in the London Underground and what the London Clay has to do with all this www.cibsejournal.com/technical/lo... #londongeology

A thermal camera image of a tube train pulling into a platform. It is coloured blue through green to red indicating the temperature range 24 (blue) to 32 (red) degrees C. The rails are deep red indicating the heat generated by breaking. The train and platforms are a cooler green and the front of the train is blue.

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A London Inheritance @alondoninheritance.bsky.social · 11/07/2026

The geology and Chalybeate Wells of Hampstead explored in my post at alondoninheritance.com/under-london...

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London Geodiversity Partnership @londongeodiversity.bsky.social · 04/07/2026

A recce trip to Keston Common yesterday to do a site audit and plan a route for our Geotrail in October. Keston Common is one of our designated Greater London Authority geosites. Watch this space for information about the upcoming Geotrail! #londongeology #bromley

A view of the natural spring which is the source of the River Ravensbourne. It is contained in a circular brick basin with a channel flowing away from it into the distance. The text reads London Geodiversity Partnership GLA 22 Keston Common.

An outcrop of pebbly Harwich Formation in an old gravel quarry. A black and white dog called Cinders is at the top of the outcrop.

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London Geodiversity Partnership @londongeodiversity.bsky.social · 27/06/2026

Are there blue birds over the white cliffs of Croydon? Possibly not, but here are our volunteers at last year’s geoconservation day at Riddlesdown pit. Find out more about London’s geology at londongeopartnership.org.uk/londons-geol... #LondonGeology #Chalk

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Ruth Siddall @pavementgeology.bsky.social · 24/06/2026

Harmondsworth Barn is one of @londongeodiversity.bsky.social's Sites of Geological Interest and you can read more about it here londongeopartnership.org.uk/wp/wp-conten...

londongeopartnership.org.uk

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Ruth Siddall @pavementgeology.bsky.social · 24/06/2026

I'll be presenting a paper on London's only local building stone, ferricrete, at the #Harmondsworth600 meeting in September. One of the oldest secular buildings in London it has a fascinating history. Full info on speakers & subjects + registration is at www.english-heritage.org.uk/visit/whats-...

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Dr Toby Driver @drtobydriver.bsky.social · 23/06/2026

High over the beautiful Llanddwyn Island on the west coast of Ynys Môn/Anglesey this afternoon during @rcahmwales.bsky.social aerial reconnaissance 🛩️ Few if any cropmarks visible in the north 😥 despite high drought readings - hopefully this will improve into July 🤞 📷 Mobile phone snap

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London Geodiversity Partnership @londongeodiversity.bsky.social · 22/06/2026

Springfield Park in Hackney is London’s only geological nature reserve. London Clay is capped by Ice Age gravels and post-glacial brickearths. The boundary between them is a spring line drive.google.com/file/d/167gh... #LondonGeology #SpringfieldPark #Hackney #londonparks

An image adapted from the cover of the leaflet which can be downloaded at the link above. It shows a view from Springfield Park across the Lea Valley which is cropped into a half circle shape. Below it is the text Discover the Springs of Springfield Park and below that is a geological map of the park showing recent alluvium, London Clay and brickearths overlying the Clay.

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Thames21 @thames21.bsky.social · 22/06/2026

As London Action Climate Week begins, it is a timely reminder that the clock is ticking on preparing our river networks for the extreme weather events that are already affecting our communities.🧵⬇️

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London Geodiversity Partnership @londongeodiversity.bsky.social · 16/06/2026

Understanding how the geology of London influences its topography though London’s views is definitely part of London Geodiversity Partnership’s remit. Do you have a favourite view of London? #LondonGeology #LondonsViews

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Becky Wallower @bwallower.bsky.social · 13/06/2026

What an interesting site!

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London Geodiversity Partnership @londongeodiversity.bsky.social · 13/06/2026

Part of our activities is designing and producing geological information boards and leaflets for London’s geosites. You can download these from our website londongeopartnership.org.uk/informationb...

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Suffolk Detectorist @sdetectorist.bsky.social · 09/06/2026

From Walton-on-the-Naze a few weeks ago. The fossilised skull of and extinct fish. A Halecopsis Insignis, from the London clay, 50-54 million years old.

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London Geodiversity Partnership @londongeodiversity.bsky.social · 09/06/2026

Leading walks and geotrails to explain London’s geology is one of London Geodiversity Partnerships activities. We organise walks across London for groups with an interest in the geology, Check out the Geotrails link at londongeopartnership.org.uk/geotrails/ #LondonGeology #Geotrails

A photo showing a group of people listening to a person leading a Geotrail. They are standing in a green field with woodland in the distance. Text reads ‘London Geodiversity Partnership: leading walks and geotrails on London’s geology #LondonGeology’

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London Geodiversity Partnership @londongeodiversity.bsky.social · 04/06/2026

We are now on Instagram! Follow us there @londongeodiversity #LondonGeology

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London Geodiversity Partnership @londongeodiversity.bsky.social · 03/06/2026

Here are a couple of photos of our recent geotrail to Croham Hurst near Croydon which took place on 29th May. 📷 @gaildickerson.bsky.social #LondonGeology #CrohamHurst

A view of people sitting on benches and standing looking at at view. However the view itself is obscured by the rising slope of the hill in the foreground. We can see the backs of people looking away from us.

The view! This photo takes in a view downhill across a wooded slope towards a suburban setting of houses and leafy streets.

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London Geodiversity Partnership @londongeodiversity.bsky.social · 29/05/2026

Some NEW research on our website - Rob Scaife & Mike Hacker's 2025 report on the pollen and geology of Highgate Wood #Haringey is available to download at londongeopartnership.org.uk/wp/wp-conten... #LondonGeology #LondonArchaeology

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London Geodiversity Partnership @londongeodiversity.bsky.social · 29/05/2026

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